J. Castellon

Institut d'Électronique et des Systèmes

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S. Agnel

Institut d'Électronique et des Systèmes

P. Notingher

Universitatea Națională de Știință și Tehnologie Politehnica București

A. Toureille

Université de Montpellier

M.F. Fréchette

Université de Sherbrooke

Davide Fabiani

University of Bologna

L. Boyer

Supergrid Institute

Thomas Andritsch

University of Southampton

Giovanni Mazzanti

University of Bologna

Shakeel Akram

Nanjing Tech University

M. Frechette

Sacred Heart University

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Centre National de la Recherche Scientifique

University of Bologna

Université de Montpellier

University of Strathclyde

University of Manchester

Central Michigan University

Institute of Electrical and Electronics Engineers

Institut d'Électronique et des Systèmes

ADA University

Human Factors (Norway)

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High resolution space charge measurement on HVDC cable insulation systems

Shuo Zhao Jean-Charles Laurentie P. Notingher J. Castellon A. Combessis

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Review of space charge measurements in high voltage DC extruded cables by the thermal step method

IEEE Electrical Insulation Magazine (2017)

J. Castellon S. Agnel P. Notingher

More than ever, controlling the amount of space charge that accumulates in high voltage DC (HVDC) extruded cables under electrical stress and a thermal gradient is a major challenge to ensure a good level of reliability of the cable and therefore a good availability of energy [1]. It is now clear that, although studies on space charge are absolutely necessary to understand the charge accumulation and relaxation phenomena, direct measurements on power cables are required to analyze and anticipate the local electric field. Thus, measurement of the electric field due to the presence of space charge within the insulation is essential for an optimal design of power cables [2]. In this article, after detailing the principle of the TSM applied to a power cable, some examples of research performed on power cable specimens in an academic research laboratory are given. In addition, technology transfer to industry, and recent measurements of space charge and electric field distribution in a HVDC extruded cable insulation, in an industry laboratory, are presented.

Power cable

High Voltage

High-voltage cable

10.1109/mei.2017.7956631

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Investigations on charge accumulation and relaxation in polycrystalline Al<inf>2</inf>O<inf>3</inf>: Correlations of surface potential measurements with other techniques

P. Molinié S. Agnel J. Castellon

Polycrystalline alumina plates have been charged by different methods (contact/corona), at temperatures from 300 to 500 K, and fields from 0.2 to 15kV/mm. The accumulation and relaxation of this charge has been studied using surface potential decay and voltage return techniques, together with current, Thermal Step Method (TSM) and Thermo Stimulated Currents (TSC) measurements. The observed conduction regime appears as nearly ohmic, but evidence of inner space charge effects is observed. An interfacial polarization model is proposed.

Ohmic contact

10.1109/icsd.2010.5568011

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Editorial

J. Castellon S. Agnel Jean-Charles Laurentie P. Notingher

This publication contains the papers presented at the 2016 International Conference on Dielectrics (ICD 2016), held in Montpellier, France, from July 3rd to July 7th, 2016.

10.1109/icd.2016.7547523

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Non destructive water-tree detection in XLPE cable insulation

J. Densley Sverre Hvidsten W. Boone Nigel Hampton Gian Carlo Montanari

Electrical treeing

Tree (set theory)

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Proposal of aging kinematics of XLPE insulation for HVDC power cables

HAL (Le Centre pour la Communication Scientifique Directe) (2017)

J. Castellon

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Development and set-up of a non-intrusive technique for measuring space charges in specimens of DC cables

Mouad Jebli Thierry Martiré J.-C. Laurentie J. Castellon P. Notingher

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Study and analysis of conduction mechanisms and space charge accumulation phenomena under high applied DC electric field in XLPE for HVDC cable application

2022 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) (2014)

Aurelien Hascoat J. Castellon S. Agnel Wilfried Frelin P. Egrot

The development of High Voltage Direct Current (HVDC) cables requires design according to specific criteria and materials with appropriate properties. Cross-linked polyethylene (XLPE) has established itself over the past 20 years as the most used insulation material for HVAC cables, but also more recently for HVDC cables. If the electrical properties of this polymer have been widely studied under AC stress, the behavior of these materials under high DC stress is less known and needs thorough investigation. It is well known that, in DC conditions, the electric field distribution is highly dependent on operating conditions (thermal gradient and electric field) and can be affected by electric charges trapped in the insulation. The resulting space charge accumulation is able to increase significantly the local electric field, thus accelerating ageing and increasing the risk of breakdown. Consequently, the influence of electrical and thermal stresses on the material properties could be a key parameter on the ageing law for HVDC insulating material. The purpose of the present work is to investigate the dielectric behavior of XLPE insulation under different combined thermal and DC electrical stresses. The first step is to evaluate the volume electrical conduction and interface injection mechanisms by using current versus voltage (I–V) measurements. The second step is to investigate the development of space charges by using a non-destructive space charge measurement technique (the Thermal Step Method).

High-voltage direct current

High Voltage

HVDC converter

10.1109/ceidp.2014.6995877

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Etude du comportement électrique du PET par mesures de charges d'espace

HAL (Le Centre pour la Communication Scientifique Directe) (2003)

S. Agnel J. Castellon P. Notingher A. Toureille J.-L. Franceschi

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